CVE-2026-48777: gtsteffaniak filebrowser · Path Traversal
Affects gtsteffaniak filebrowserSource CVE Database V5
Mentioned vulnerabilities
Not known to be exploited · CVSS 9.3 Critical : upgrade to 1.4.2-beta or 1.3.3-stable as a priority.
Data as of 30 Oct 2026, 06:59 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 45% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 1.4.2-beta, 1.3.3-stable, 1.4.2 +1
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 16 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade filebrowser to 1.4.2-beta or 1.3.3-stable; gtsteffaniak/filebrowser to 1.4.2 or 1.3.3.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| gtsteffaniakfilebrowser | Affected
| Fixed in
|
| gtsteffaniakfilebrowser | Affected
| Fixed in
|
GitHubgtsteffaniak/filebrowserpkg:github/gtsteffaniak/filebrowserOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
This vulnerability has been fixed in versions 1.3.3-stable and 1.4.2-beta of filebrowser. Users should upgrade to these or later versions to remediate the issue. Since this is a self-hosted product, patching is the primary mitigation. No vendor advisory content contradicts this; therefore, upgrading is the recommended action.
Description
CVE-2026-48777 is a critical path traversal vulnerability in the gtsteffaniak filebrowser product, specifically affecting versions prior to 1.3.3-stable and 1.4.2-beta. The flaw exists in the publicPatchHandler endpoint, where user-controlled path inputs are joined with a trusted base path before sanitization, allowing traversal outside the intended directory. This enables an attacker with a public share link that has AllowModify=true to move, copy, or rename arbitrary files within the share owner's root directory. The issue was fixed in versions 1.3.3-stable and 1.4.2-beta.